code: def test_datetime(self):
      self.assertEqual(dshape("datetime")[0].tz, None)
      self.assertEqual(dshape('datetime[tz="UTC"]')[0].tz, "UTC")
      self.assertEqual(
          dshape('datetime[tz="America/Vancouver"]')[0].tz,
          "America/Vancouver",
      )
      self.assertEqual(
          str(dshape('datetime[tz="UTC"]')), "datetime[tz='UTC']"
      )
  
imports: from __future__ import absolute_import, division, print_function
  import ctypes
  import unittest
  import pytest
  from datashader import datashape
  from datashader.datashape import dshape, error, DataShape, Record
label_desc: Use image node_id 11 for calling the TestDataShapeCreation obj's underlying member method code with example usage: obj.test_datetime() without return types